/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.easyseata.core.context;

import javax.annotation.Nullable;
import java.util.Map;

/**
 * The interface Context core.
 *
 */
public interface ContextCore {

    /**
     * Put value.
     *
     * @param key   the key
     * @param value the value
     * @return the previous value associated with the key, or null if there was no mapping for the key
     */
    @Nullable
    Object put(String key, Object value);

    /**
     * Get value.
     *
     * @param key the key
     * @return the value
     */
    @Nullable
    Object get(String key);

    /**
     * Remove value.
     *
     * @param key the key
     * @return the removed value or null
     */
    @Nullable
    Object remove(String key);

    /**
     * entries
     *
     * @return the key-value map
     */
    Map<String, Object> entries();
}
